<h1>ConfigController#edit</h1>
<form action="/config/update" method="post">
  <fieldset>
  <legend>Edit Config</legend>
    <p>k: <input type="text" name="k" value="{{ k }}"></p>
    <p>v: <textarea name="v" rows="8" cols="40">{{ v }}</textarea></p>
    <p><input type="submit" value="Submit"></p>
    <p><input type="reset" value="Reset"></p>
    <p><input type="button" value="Cancel" onClick="javascript: history.go(-1)"></p>
    <p><input type="hidden" name="key" value="{{ params.key }}"></p>
  </fieldset>
</form>